Abstract: A compound having a first ligand of the following is described. Ring A represents a monocyclic aromatic group or a polycyclic aromatic group. Ring B represents a polycyclic aromatic group. Z is a carbon. Z and the right N are coordinated to a metal to form a five-membered chelate ring. R1 and R2 independently represent mono to a maximum possible number of substitutions, or no substitution.

Abstract: A heteroacene having the following formula (F) is described. An organic electroluminescence device comprises the heteroacene as a phosphorescent host, a fluorescent host, a hole blocking layer, or an electron transport layer. The heteroacene lowers a driving voltage, or increases a current efficiency or a half-life of the organic electroluminescence device.

Abstract: An organic compound having the following formula (F) is disclosed. An organic electroluminescence device comprises the organic compound as a phosphorescent host, a fluorescent host, a hole blocking layer, or an electron transport layer. The organic compound is for lowering a driving voltage, or increasing a current efficiency or a half-life of an organic electroluminescence device. The same definition as described in the present invention.

Abstract: An organic compound having one the following structure of formula (1) to formula (5) is described: The application in a red OLED is also described.

Abstract: An organic compound having one the following structure of formula (1) is described: The application in a blue OLED is also described.

Abstract: The present invention discloses an organic compound represented by the following formula (1) and an organic electroluminescence device using the organic compound as the phosphorescent host material, the fluorescent host material, the fluorescent dopant material, the hole blocking material, or the electron transport material. The organic compound may lower a driving voltage and power consumption or increase a current efficiency or a half-life time of the organic electroluminescence device. The same definition as described in the present invention.

Abstract: A heteroaromatic compound which can be used as the fluorescent guest material in the light emitting layer of the organic electroluminescence device is disclosed. The organic electroluminescence device employing the heteroaromatic compound of the present invention shows lower power consumption, higher efficiency, and longer half-life time than the existed organic electroluminescence devices.

Abstract: A compound having a first ligand of the following is described. Ring A represents a monocyclic aromatic group or a polycyclic aromatic group. Ring B represents a polycyclic aromatic group. Z is a carbon. Z and the right N are coordinated to a metal to form a five-membered chelate ring. R1 and R2 independently represent mono to a maximum possible number of substitutions, or no substitution.

Abstract: A heteroacene having the following formula (F) is described. An organic electroluminescence device comprises the heteroacene as a phosphorescent host, a fluorescent host, a hole blocking layer, or an electron transport layer. The heteroacene lowers a driving voltage, or increases a current efficiency or a half-life of the organic electroluminescence device. The same definition as described in the present invention.

Abstract: The present invention discloses an organic compound represented by the following formula (1) and an organic electroluminescence device using the organic compound as the phosphorescent host material, the fluorescent host material, the fluorescent dopant material, the hole blocking material, or the electron transport material. The organic compound may lower a driving voltage and power consumption or increase a current efficiency or a half-life time of the organic electroluminescence device. The same definition as described in the present invention.

Abstract: The present invention discloses an organic compound represented by the following formula (1) and an organic electroluminescence device using the organic compound as the phosphorescent host material, the fluorescent host material, or the fluorescent dopant material. The organic compound may lower a driving voltage or power consumption, or may increase a current efficiency or half-life of the organic electroluminescence device. The same definition as described in the present invention.

Abstract: The present invention discloses an iridium complex represented by the following formula (1) and an organic electroluminescence device using the iridium complex as a phosphorescent dopant material. The phosphorescent dopant material may lower a driving voltage and power consumption and increase a current efficiency and half-life of the organic electroluminescence device. The same definition as described in the present invention.

Abstract: The present invention discloses an iridium complex of formula (1) and an organic electroluminescence device employing the iridium complex as the phosphorescent dopant material. The organic EL device can display good performance, such as lower driving voltage, reduced power consumption, increased efficiency, and longer half-life time.

Abstract: A heteroaromatic compound which can be used as the fluorescent guest material in the light emitting layer of the organic electroluminescence device is disclosed. The organic electroluminescence device employing the heteroaromatic compound of the present invention shows lower power consumption, higher efficiency, and longer half-life time than the existed organic electroluminescence devices.

Abstract: The present invention discloses an organic material represented by the following formula (1) or formula (2), the organic EL device employing the organic compound as light emitting host of emitting lay and/or an electron transporting layer, and/or a hole blocking layer, and/or a delayed fluorescence material of emitting layer can display good performance. wherein A is an electron acceptor moiety, B represents a fused ring hydrocarbon units with two or three rings; m, n, L, and X are the same definition as described in the present invention.

Abstract: An iridium complex of formula (1) and an organic electroluminescence device employing the iridium complex as the phosphorescent dopant material are described. The organic EL device can display good performance, such as lower driving voltage, reduced power consumption, increased efficiency, and longer half-life time.

Abstract: The present invention discloses an iridium complex of formula (1) and an organic electroluminescence device employing the iridium complex as the phosphorescent dopant material. The organic EL device can display good performance, such as lower driving voltage, reduced power consumption, increased efficiency, and longer half-life time.

Abstract: The present invention discloses an organic material represented by the following formula (1) or formula (2), the organic EL device employing the organic compound as light emitting host of emitting lay and/or an electron transporting layer, and/or a hole blocking layer, and/or a delayed fluorescence material of emitting layer can display good performance. wherein A is an electron acceptor moiety, B represents a fused ring hydrocarbon units with two or three rings; m, n, L, and X are the same definition as described in the present invention.